EP0025149B2 - Apparat zum Messen des Durchflusses von Gas - Google Patents

Apparat zum Messen des Durchflusses von Gas Download PDF

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Publication number
EP0025149B2
EP0025149B2 EP80104949A EP80104949A EP0025149B2 EP 0025149 B2 EP0025149 B2 EP 0025149B2 EP 80104949 A EP80104949 A EP 80104949A EP 80104949 A EP80104949 A EP 80104949A EP 0025149 B2 EP0025149 B2 EP 0025149B2
Authority
EP
European Patent Office
Prior art keywords
opening
supply path
gas
main supply
bypass
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP80104949A
Other languages
English (en)
French (fr)
Other versions
EP0025149B1 (de
EP0025149A3 (en
EP0025149A2 (de
Inventor
Kanemasa Sato
Sadayasu Ueno
Kazuhiko Miya
Yoshishige Oyama
Yutaka Nishimura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of EP0025149A2 publication Critical patent/EP0025149A2/de
Publication of EP0025149A3 publication Critical patent/EP0025149A3/en
Application granted granted Critical
Publication of EP0025149B1 publication Critical patent/EP0025149B1/de
Publication of EP0025149B2 publication Critical patent/EP0025149B2/de
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
    • G01F1/6842—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow with means for influencing the fluid flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F5/00—Measuring a proportion of the volume flow

Definitions

  • the present invention relates to a flow measuring device and, more particularly, to an apparatus for measuring the flow rate of a gas.
  • An air flow measuring apparatus having a heat generating resistance body such as a platinum wire mounted in a path of air flow by means of an attachment is known from the specification of United States Patent No. 3824966 issued to Schneider at al on July 23, 1974.
  • This air flow measuring apparatus suffers, when used as an air flow measuring apparatus for measuring the intake air flow rate in an internal combustion engine, that the wire is burnt out or deteriorated due to the reverse flow of gas in the event of a back fire and, accordingly, has a poor durability.
  • the adjustment of the tension of the wire is extremely difficult. Namely, if the tension is excessively large, the wire becomes more liable to be broken. To the contrary, a too low tension inconveniently permits the wire to be vibrated to cause a degradation of the precision of measurement.
  • the United States Patent No. 3559482 granted on Baker et al of February 2, 1971 proposes to dispose an air flowing measuring apparatus in a bypass passage between an opening disposed at a portion of the air intake passage downstream from a venturi and an opening formed at a portion of the same upstream from the venturi.
  • This air flow measuring apparatus is superior in that it can shelter from the reversing flow of gas in the event of back fire and that the installation of the air flow measuring apparatus is comparatively easy.
  • the size of the apparatus can be made considerably small.
  • the US-A 3683692 proposes to dispose an air flow measuring apparatus in a bypass member between an opening disposed at a portion of the air intake passage downstream from a plate having a certain number of calibrated perforations and an opening disposed at a portion of the air intake passage upstream from said plate which is mounted in the main supply path perpendicularly to the gas flow direction.
  • a spacer is interposed between the main supply path and the bypass member and is provided with an opening communicating with a narrow groove in said bypass member which groove communicates with a cylindrical cavity in the central part of the bypass member with cavity contains a sensing element.
  • the gas flow passage through the bypass member is rather complicated.
  • DE-A 2653359 discloses an apparatus for measuring the flow rate of a gas, comprising a main supply path having two openings formed in the wall thereof and connected to each other by a bypass air passage wherein a pair of resistance members is disposed, the main supply path containing a venturi member having its narrowest section at the second opening as seen in the flow direction.
  • an object of the invention to provide an air flow measuring apparatus easily adjustable for different measuring characteristics and, hence, suitable for a mass-production.
  • an apparatus for measuring the flow rate of a gas comprising: a main supply path through which said gas flows, said main supply path having a first and a second opening formed in the wall thereof and spaced by a predetermined distance in the direction of flow of said gas; a bypass member detachably fixed to the outside of said main supply path and provided with a groove being communicated at its one end with said first opening, said groove being elongate and straight; a spacer interposed between said main supply path and said bypass member and provided with an opening corresponding to said groove of said bypass member, said groove and said opening defining a bypass air passage; and a gas flow meter including a pair of resistance members disposed within said bypass member, characterized in that a venturi member is disposed in said main supply path with at least part thereof between said first and second openings and adapted to maintain a higher pressure at said first opening than at said second opening; said groove has a length greater than the distance between said first and second openings and communicates at its other end with
  • an intake barrel 10 is a stepped cylindrical member the inside diameter of which is greater at the upstream side than at the downstream side thereof.
  • a venturi member 12 is inserted into the intake barrel from the upstream side end of the latter, and is fixed to the inside of the intake barrel 10 by means of a pipe 18 whih is driven into an opening 14 formed at the outside of the central portion of the venturi member 12 and an opening 16 formed in the wall of the intake barrel 10 at a portion of the latter confronting the opening 14.
  • An opening 20 is formed at the narrowest throat portion 19 of the venturi member 12 so as to communicate with the pipe 18.
  • An opening 22 is formed in the wall of the intake barrel 10 at a portion of the latter upstream from the venturi member 12.
  • the opening 22 and the opening 20 in the venturi member 12 are located on a line parallel to the central axis of the intake barrel 10.
  • the opening 22 is provided with a filter 24.
  • a bypass passage forming member 28 made of a synthetic resin and provided with a rectangular groove 26 of a length greater than the distance between the openings 20, 22 is fixed to the outside of the intake barrel 10.
  • a spacer 32 made of a synthetic resin is placed between the bypass passage forming member 28 and the intake barrel 10. The spacer 32 is provided with a rectangular bore of a size equal to that of the groove 26.
  • the openings 22 and 20 are communicated with each other to form a bypass passage 34.
  • a circuit board 38 is accommodated by a recess 36 formed in the bypass passage forming member 28 so as to oppose to the groove 26.
  • Two sets of support pins 40, 42 extending through the central portion of the bypass passage forming member 28 are connected at their one ends to the electronic parts of the circuit board 38, while the other ends of the same are connected to a flow rate sensor 44 and a temperature compensation sensor 46.
  • the flow rate sensor 44 is a resistance member whose resistance value is varied at a high sensitivity in response to a change in the flow rate
  • the temperature compensation sensor 46 is a resistance member whose resistance value depends on the air temperature irrespective of the air flow rate.
  • the flow rate sensor 44 and the temperature compensation sensor 46 are connected to two sides of a bridge circuit formed on the circuit board 38.
  • the circuit board 38 is coated with an antihu- midity insulating material 52 so that the electric insulating performance thereof is much improved.
  • the recess 36 is filled with an insulating filler 54 and is then sealed by means of a cover 55.
  • a connector 56 provided at the outside of the bypass forming passage 28 is connected to a terminal 58 so as to supply the bridge circuit on the circuit board 38 with the required electric power.
  • an air flow meter is formed on the bypass passage forming member 28 by means of the flow rate sensor 44, temperature compensation sensor 46 and the circuit board including the bridge circuit.
  • the level of vacuum generated around the opening 20 of the venturi member 12 is changed in accordance with the change of flow rate of air passing the intake barrel 10. Accordingly, the velocity of air flowing through the bypass air passage 34 is changed.
  • the change of the velocity of air is detected by the flow rate sensor 44 and the temperature compensation sensor 46 which are connected in a bridge, and an electric output corresponding to the flow rate of air flowing through the intake barrel 10 is derived from the output terminal 60.
  • This principle of operation is disclosed, in, for example, the specification of United States Patent No. 3 824 966.
  • the intake barrel 10 is communicated at its downstream side end with the combustion chamber of the engine through the throttle valve chamber and the intake pipe.
  • a fuel injection valve is disposed at a portion of the throttle valve chamber downstream from the throttle valve. The operation of the fuel injection valve is controlled in relation to the output signal derived from the output terminal 60.
  • the flow meter is less liable to be affected by the reversing flow of gas, even when a back fire happens to take place, partly because the openings 20, 22 of the bypass air passage 34 are sufficiently small and partly because these openings are arranged at a right angle to the intake passage, so that the erroneous measurement of the air flow rate is avoided.
  • the bypass passage forming member 28 is made of a synthetic resin having a low thermal conductivity, the temperature of air flowing through the bypass passage 28 is never changed. The stabilization of the air temperature in turn suppresses the density of air to ensure a precise measurement of the air flow rate.
  • the air flow measuring apparatus of the invention can apply to engines of different capacities. Namely, when the air flow measuring apparatus is applied to an engine having a larger capacity, the venturi member 12 is replaced with another venturi member having a larger cross-sectional area of passage and the spacer 32 is replaced with another spacer having a greater thickness. By so doing, the cross-sectional area to the bypass air passage 34 is increased to lower the flowing velocity of air flowing therethrough to magnify the measure- able range of the intake air flow rate.
  • the intake barrel 10 and the bypass passage forming member 28 are commonly used for various capacities of engine, so that the measuring apparatus can suitably be mass-produced and the efficiency of assembling of the air flow meter is improved.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Claims (5)

1. Gasdurchflussmessgerät, umfassend: eine Hauptzufuhrbahn (10), durch die das Gas strömt und die eine erste und eine zweite Öffnung (22, 16) in ihrer Wandung aufweist, wobei diese Offnungen in Strömungsrichtung des Gases einen vorbestimmten Abstand voneinander haben; ein Bypassorgan (28), das an der Aussenseite der Hauptzufuhrbahn (10) abnehmbar befestigt ist und eine Nut (26) aufweist, deren eines Ende mit der ersten Öffnung (22) in Verbindung steht, wobei diese Nut lang und gerade ist; einen Abstandhalter (32), der zwischen der Hauptzufuhrbahn (10) und dem Bypassorgan (28) angeordnet und mit einer Öffnung (30) versehen ist, die der Nut (26) des Bypassorgans (28) angepasst ist, wobei die Nut und die Öffnung einen Bypassluftkanal (34) definieren; und einen Gasdurchflussmesser mit zwei Widerstandselementen (44, 46), die in dem Bypassorgan (28) angeordnet sind, dadurch gekennzeichnet, dass ein Venturieinsatz (12) in der Hauptzufuhrbahn (10) wenigstens zum Teil zwischen der ersten und der zweiten Öffnung (22, 16) angeordnet und so ausgebildet ist, dass er an der ersten Öffnung (22) einen höheren Druck als an der zweiten Öffnung (16) unterhält; die Länge der Nut (26) grösser als der Abstand zwischen der ersten und der zweiten Öffnung (22, 16) ist und das andere Ende der Nut mit der zweiten Öffnung (16) in Verbindung steht; die beiden Widerstandselemente (44, 46) in der Nut (26) des Bypassorgans (28) angeordnet sind; das Bypassorgan (28) ausserdem eine Ausnehmung (36) aufweist, die auf der der Längsnut (26) abgewandten Seite des Bypassorgans ausgebildet ist und eine Leiterplatte (38) zur Verarbeitung von Signalen der Widerstandselemente (44, 46) aufnimmt; und wenigsten ein weiterer Abstandhalter (32), dessen Dicke von der des erstgenannten Abstandhalters (32) verschieden ist, vorgesehen ist, durch den der erstgenannte Abstandhalter (32) ersetzbar ist, wodurch der Durchflussquerschnitt des Bypassluftkanals (34) in Abhängigkeit von der Dicke des Abstandhalters (32) änderbar ist.
2. Gasdurchflussmessgerät nach Anspruch 1, dadurch gekennzeichnet, dass ausserdem ein Filter (24) in der ersten Öffnung (22) der Hauptzufuhrbahn (10) angeordnet ist.
3. Gasdurchflussmessgerät nach Anspruch 1, wobei eines der beiden Widerstandselemente ein Durchflussgeberwiderstand (44) und das andere der beiden Widerstandselemente ein Temperaturausgleichswiderstand (46) ist und wobei eine Brückenschaltung vorgesehen ist, bei der zwei Seiten von dem Durchflussgeberwiderstand (44) und dem Temperaturausgleichswiderstand (46) gebildet sind.
4. Gasdurchflussmessgerät nach Anspruch 1, wobei die Hauptzufuhrbahn durch ein zylindrisches Organ (10) definiert ist, dessen Innendurchmesser an seiner Aufstromseite grösser als an seiner Abstromseite ist, wobei der durchmessergrosse Abschnitt der Hauptzufuhrbahn (10) die in deren Wandung gebildete erste und zweite Öffnung (22, 16) aufweist, und der Venturieinsatz (12) in den durchmessergrossen Abschnitt der Hauptzufuhrbahn (10) eingesetzt ist und an seinem engsten Trichterabschnitt (19) eine dritte Öffnung (20) aufweist, die mit der zweiten Öffnung (16) in Verbindung steht.
5. Gasdurchflussmessgerät nach Anspruch 4, wobei der Venturieinsatz (12) durch einen weiteren Venturieinsatz (12) mit davon verschiedenem Durchflussquerschnitt austauschbar ist, um die GasströmungsgeschwindigkeitdurchdasBypassorgan (28) zu regeln.
EP80104949A 1979-08-22 1980-08-20 Apparat zum Messen des Durchflusses von Gas Expired EP0025149B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP105899/79 1979-08-22
JP54105899A JPS6045806B2 (ja) 1979-08-22 1979-08-22 発熱抵抗体を用いた空気流量計

Publications (4)

Publication Number Publication Date
EP0025149A2 EP0025149A2 (de) 1981-03-18
EP0025149A3 EP0025149A3 (en) 1983-04-13
EP0025149B1 EP0025149B1 (de) 1986-02-26
EP0025149B2 true EP0025149B2 (de) 1989-10-18

Family

ID=14419726

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80104949A Expired EP0025149B2 (de) 1979-08-22 1980-08-20 Apparat zum Messen des Durchflusses von Gas

Country Status (4)

Country Link
US (1) US4381668A (de)
EP (1) EP0025149B2 (de)
JP (1) JPS6045806B2 (de)
DE (1) DE3071448D1 (de)

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DE3130626A1 (de) * 1981-08-01 1983-02-17 Robert Bosch Gmbh, 7000 Stuttgart Vorrichtung zur messung der masse eines stroemenden mediums
DE3130624A1 (de) * 1981-08-01 1983-02-17 Robert Bosch Gmbh, 7000 Stuttgart Luftmassenmessvorrichtung
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JPS58105013A (ja) * 1981-12-18 1983-06-22 Hitachi Ltd 熱線式流量計
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JP4168417B2 (ja) * 2002-11-18 2008-10-22 株式会社山武 流体検出装置
DE10316342A1 (de) * 2003-04-10 2004-10-28 Daimlerchrysler Ag Massenstrommessvorrichtung
US7228729B1 (en) 2006-07-26 2007-06-12 Lincoln Industrial Corporation Apparatus and method for testing fuel flow
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US7587931B2 (en) * 2008-01-29 2009-09-15 Lincoln Industrial Corporation Apparatus and method for testing fuel flow
US8393228B2 (en) * 2010-05-18 2013-03-12 Mindray Medical Sweden Ab Method and system for measuring a flow
DE102011115768B4 (de) 2011-10-12 2014-05-08 Hydrometer Gmbh Gaszähler
EP2589821B1 (de) * 2011-11-03 2017-08-02 Heraeus Medical GmbH Vorrichtung und Verfahren zur Erzeugung von Vakuum für Vakuumzementiersysteme
US9707369B2 (en) * 2013-06-28 2017-07-18 Vyaire Medical Capital Llc Modular flow cassette
US9962514B2 (en) 2013-06-28 2018-05-08 Vyaire Medical Capital Llc Ventilator flow valve
US9795757B2 (en) 2013-06-28 2017-10-24 Vyaire Medical Capital Llc Fluid inlet adapter
US9541098B2 (en) 2013-06-28 2017-01-10 Vyaire Medical Capital Llc Low-noise blower
US9746359B2 (en) 2013-06-28 2017-08-29 Vyaire Medical Capital Llc Flow sensor
US9297679B2 (en) * 2014-01-14 2016-03-29 General Electric Company Flowmeter with a flow conditioner formed by a protrusion having restriction provided upstream of the measurement section
JP2016090413A (ja) 2014-11-06 2016-05-23 日立オートモティブシステムズ株式会社 熱式空気流量計
JP6933591B2 (ja) * 2018-02-23 2021-09-08 株式会社ミクニ スロットル装置及び燃料蒸発ガス回収システム
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Also Published As

Publication number Publication date
JPS6045806B2 (ja) 1985-10-12
JPS5630616A (en) 1981-03-27
US4381668A (en) 1983-05-03
EP0025149B1 (de) 1986-02-26
DE3071448D1 (en) 1986-04-03
EP0025149A3 (en) 1983-04-13
EP0025149A2 (de) 1981-03-18

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